Migrate CentOS 8 to Rocky Linux

Updated on March 2, 2022

Earlier I had written about CentOS 8 error: Failed to download metadata for repo  “AppStream” and followed by converting CentOS 8 to CentOS Stream. Finally, I had suggested migrating CentOS 8 to Rocky Linux, AlmaLinux, or Oracle Linux that provides Long Term Support (LTS). In this tutorial, we shall learn to migrate CentOS 8 to Rocky Linux.

What is Rocky Linux?

Rocky Linux is an open-source operating system compatible with Red Hat Enterprise Linux® and a replacement for CentOS 8. Rocky Linux Project has provided a shell script that shall help us to migrate CentOS 8 Linux to Rocky Linux 8 hassle-free.

Pre-requisites for migration

Step 1: Backup necessary files/folder

Back up all your necessary files and folders. If you are running as a VM, take a snapshot of it.

Step 2: Update to CentOS v8.5

Migration of CentOS 8 to Rocky Linux is only supported by v8.5. Therefore update your CentOS 8 to the latest version

[root@centos8-rocky ~]# dnf update

Step 3: Verify CentOS version to 8.5

[root@centos8-rocky ~]# cat /etc/centos-release
CentOS Linux release 8.5.2111

Step 4: Install git

Follow instructions to install git to clone the repo to install the migration tool provided by Rocky Linux Community.

Step 5: Download the Migration tool

Once git is installed, clone the repo rocky-tools.

[root@centos8-rocky ~]# git clone https://github.com/rocky-linux/rocky-tools
Cloning into 'rocky-tools'...
remote: Enumerating objects: 597, done.
remote: Counting objects: 100% (315/315), done.
remote: Compressing objects: 100% (212/212), done.
remote: Total 597 (delta 175), reused 160 (delta 99), pack-reused 282
Receiving objects: 100% (597/597), 150.87 KiB | 380.00 KiB/s, done.
Resolving deltas: 100% (248/248), done.

How to migrate CentOS 8 to Rocky Linux

Step 6: Change directory to rocky-tools/migrate2rocky

[root@centos8-rocky ~]# cd rocky-tools/migrate2rocky/

Step 7: Set execute permissions to migrate2rocky.sh

[root@centos8-rocky migrate2rocky]# chmod +x migrate2rocky.sh

Step 8: Start the migration

[root@centos8-rocky migrate2rocky]# ./migrate2rocky.sh -r
migrate2rocky - Begin logging at Wed 02 Mar 2022 05:18:10 PM IST.

Removing dnf cache
Preparing to migrate CentOS Linux 8 to Rocky Linux 8.

Sit back and relax, the script will take quite a time to convert everything, depending on the machine and the internet connection.

Step 9: Reboot the system

Once the above step completes, reboot the server.

[root@centos8-rocky migrate2rocky]# reboot

Step 10: Verify the migration

Once the system reboots, log in to the system and run the below command to verify the successful migration.

[root@centos8-rocky migrate2rocky]# cat /etc/centos-release
Rocky Linux release 8.5 (Green Obsidian)

That’s It!

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